A plastic pipe guide buffer device

Abstract

The invention discloses a plastic pipe guide buffer device, comprising a bracket, a lever, a guide roller assembly and a counterweight mechanism, wherein the lever is movably mounted on the bracket, the guide roller assembly comprises two guide pulley assemblies, the guide pulley assembly comprises guide pulleys, the two guide pulleys are symmetrically mounted on one end of the lever, the two guide pulleys are directly opposite, and the space surrounded by the two guide pulleys is a pipe channel, the counterweight mechanism comprises a counterweight assembly and a driving mechanism, the driving mechanism is mounted on the bracket, the counterweight assembly is connected to the driving mechanism and the lever respectively, the driving mechanism can drive the counterweight assembly to reciprocate along the length direction of the lever, the connection between the lever and the bracket forms a fulcrum, and the lever reaches balance under the action of the gravity of the guide roller assembly and the counterweight assembly. The device has a simple structure and a clever design, does not require manual lifting, and can automatically adjust the production speed of the front and rear of the production line, thereby improving the quality of the plastic pipe, improving the production efficiency, and reducing the production cost.

Description

Technical Field

[0001] The invention relates to the technical field of plastic pipe production equipment, and in particular to a plastic pipe guiding buffer device. Background Art

[0002] At present, in the existing pipe production process, after the inner pipe of the large steel-plastic pipe is shaped and cooled, it needs to cross a series of devices such as grinding, shaping, and buffer brackets from high altitude to reach the device of the bonding steel belt and the welded steel belt. Because the inner pipe is too heavy and the walking distance is too far, a support guide device is required. The previous guide device is a simple roller bracket. The roller is installed at a high position, which makes it difficult for the pipe to pass through when the machine is turned on. It also needs to be manually lifted with a U-shaped fork. Due to the weight of the pipe, the lifting action is difficult to operate manually. Therefore, the production speed is slow, 0.25 meters / minute. Even in normal production, the accumulation of slight deviations in the production speed before and after the production line will cause the pipe to straighten or sag, seriously affecting the product quality. It is necessary to manually adjust the production speed on the main machine to match it, which causes difficulty in operation, poor production stability, waste of manpower and time, and cannot guarantee product quality. Summary of the invention

[0003] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a plastic pipe guiding and buffering device, which has a simple structure and ingenious design, does not require manual lifting, and can automatically adjust the front and rear production speeds of the production line, thereby improving the quality of the plastic pipe, improving production efficiency, and reducing production costs.

[0004] The technical solution adopted to achieve the above-mentioned purpose of the present invention is: a plastic pipe guiding and buffering device, including a bracket, a lever, a guide roller assembly and a counterweight mechanism, the lever is movably installed on the bracket, the guide roller assembly includes two guide pulley assemblies, the guide pulley assembly includes guide pulleys, the two guide pulleys are symmetrically installed on one end of the lever, the two guide pulleys are opposite to each other, and the space surrounded by the two guide pulleys is a pipe channel, the counterweight mechanism includes a counterweight assembly and a driving mechanism, the driving mechanism is installed on the bracket, the counterweight assembly is connected to the driving mechanism and the lever respectively, the driving mechanism can drive the counterweight assembly to reciprocate along the length direction of the lever, the connection between the lever and the bracket forms a fulcrum, and the lever reaches balance under the action of the gravity of the guide roller assembly and the counterweight assembly.

[0005] The other end of the lever is provided with a guide groove along its length direction. The counterweight assembly includes a counterweight block and a guide shaft. The guide shaft passes through the counterweight block, and the counterweight block is fixed on the guide shaft. The guide shaft passes through the lever through the guide groove. One end of the guide shaft is connected to the driving mechanism, and the driving mechanism drives the guide shaft to slide reciprocatingly along the guide groove.

[0006] The counterweight assembly also includes a guide roller. The other end of the lever is provided with a slide groove along its length direction. The bottom of the slide groove is connected to the guide groove. The guide roller is located in the slide groove. The guide roller is cooperatively connected to the slide groove, and the guide roller is fixedly sleeved on the guide shaft.

[0007] The driving mechanism includes a motor, a transmission shaft, a driving wheel, a synchronous belt, a driven wheel and a driven wheel shaft. The motor is installed on a bracket, one end of the transmission shaft is fixed to the output shaft of the motor, a through hole is provided in the middle part of the lever, the transmission shaft passes through the through hole, and the lever and the transmission shaft are clearance-matched, the driving wheel is fixedly sleeved on the other end of the transmission shaft, one end of the driven wheel shaft is fixed to the other end of the lever through a connecting bearing, the driven wheel is fixedly sleeved on the driven wheel shaft, the driving wheel and the driven wheel are connected by a synchronous belt, one end of the guide shaft is fixed to the synchronous belt, and the synchronous belt and the counterweight are respectively located on opposite sides of the lever.

[0008] One end of the guide shaft is provided with a mounting surface, and the mounting surface of the guide shaft is fixed on the synchronous belt by fastening bolts.

[0009] The bracket includes a column and a support seat, the support seat is L-shaped, and the support seat includes a support horizontal plate and a support vertical plate. The bottom of the support vertical plate is connected to one side of the support horizontal plate, the support horizontal plate is fixed on the top of the column, the motor is installed on the support horizontal plate, the transmission shaft passes through the support vertical plate, and the transmission shaft and the support vertical plate are connected through a connecting bearing.

[0010] The lever is connected to a limiting sleeve, which is coaxial with the through hole. A groove is provided on the side of the supporting vertical plate opposite to the lever, and a limiting bearing is provided in the groove. The limiting sleeve is connected to the supporting vertical plate through the limiting bearing, and the transmission shaft passes through the limiting sleeve, and the transmission shaft and the limiting sleeve are clearance-matched.

[0011] It also includes a limit mechanism, which includes a bending limit switch, a stretching limit switch and a limit platform. The limit platform is horizontally arranged and fixed on the column. The bending limit switch is installed on the limit platform, and the stretching limit switch is installed on the column. The bending limit switch and the stretching limit switch are respectively located on opposite sides of the column. The bending limit switch and the stretching limit switch are both located on one side of the lever. The side of the lever connected to the guide roller is located directly above the bending limit switch. The limit platform is located directly below the bending limit switch. The trigger point of the bending limit switch and the lever can rotate in the same plane. The side of the lever connected to the counterweight block is located directly above the stretching limit switch, and the bending limit switch is located above the stretching limit switch. When the guide roller moves downward to a specific position, the lever triggers the bending limit switch or contacts the limit platform. When the guide roller continues to move upward to the upper limit position, the lever triggers the stretching limit switch.

[0012] The guide pair of rollers assembly also includes a support shaft and a mounting plate, one end of the support shaft is fixed to one end of the lever, the support shaft passes through the mounting plate, the mounting plate and the support shaft are connected by a connecting bearing, the lever is parallel to the mounting plate, the guide pulley assembly also includes a pulley shaft, one end of the two pulley shafts is fixed to the mounting plate, and the two pulley shafts are respectively perpendicular to the mounting plate, the two guide pulleys are respectively sleeved on the two pulley shafts, the two guide pulleys are respectively matched with the two pulley shafts, and the two guide pulleys are close to each other.

[0013] Compared with the prior art, the beneficial effects and advantages of the present invention are:

[0014] 1. The device has a simple structure and ingenious design. It makes full use of the lever principle. When the force arm of the counterweight is adjusted to the minimum by the motor, the guide rollers drop to the lowest position, which makes it easy to pass the plastic pipe through the guide rollers. After the pipe passes through the guide rollers, the force arm of the counterweight can be adjusted to the maximum by the motor, and the guide rollers rise to the highest position to lift the plastic pipe. It can be seen that the use of this device is simple for plastic pipe threading, and lifting does not require manual operation, saving manpower and time, and reducing production costs.

[0015] 2. When the extrusion speed of the front pipe extruder is too fast, the plastic pipe is too loose and bends. The weight of the plastic pipe breaks the balance of the lever, causing the lever to rotate backward. When the lever rotates to trigger the bending limit switch, the bending limit switch transmits a signal to the host. The host controls the pipe extruder to appropriately reduce the extrusion speed of the pipe to achieve a balance between the production rates before and after the production line. When the extrusion rate of the front pipe extruder is too slow, the plastic pipe is too tight and straightened. The tension of the plastic pipe breaks the balance of the lever, causing the lever to rotate forward. When the lever rotates to trigger the stretching limit switch, the stretching limit switch transmits a signal to the host. The host controls the pipe extruder to appropriately increase the extrusion rate of the pipe to achieve a balance between the production rates before and after the production line.

[0016] 3. The device can lift and buffer the plastic pipe, so that the production rate of the production line is stable, the stability of the composite molding of the plastic pipe is improved, and the quality of the plastic pipe is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the production line coordination diagram for the plastic pipe guiding buffer device.

[0018] Figure 2 This is a schematic diagram of the plastic pipe guide buffer device when it is lifted.

[0019] Figure 3 for Figure 2 A partial enlarged view of I

[0020] Figure 4 for Figure 2 Left view of .

[0021] Figure 5 for Figure 4 A partial enlarged view of J in the figure.

[0022] Figure 6 This is the assembly drawing of the counterweight assembly and the lever.

[0023] Figure 7 Schematic diagram of triggering the bending limit switch for the plastic pipe guide buffer device.

[0024] Figure 8 Schematic diagram of triggering the stretching limit switch for the plastic pipe guide buffer device.

[0025] Among them, 1-plastic pipe guide buffer device, 2-traction machine, 3-metal belt unwinder, 4-cache rack, 5-plastic pipe, 6-guide groove, 7-counterweight, 8-guide shaft, 9-guide roller, 10-motor, 11-transmission shaft, 12-driving wheel, 13-synchronous belt, 14-driven wheel, 15-driven wheel shaft, 16-mounting surface, 17-fastening bolt, 18-column, 19-support horizontal plate, 20-support vertical plate, 21-limit sleeve, 22-groove, 23-limit bearing, 24-bending limit switch, 25-stretching limit switch, 26-support shaft, 27-mounting plate, 28-pulley shaft, 29-guide pulley, 30-lever, 31-limit platform, 32-slide groove, 33-counterweight plate. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the accompanying drawings.

[0027] The structure of the plastic pipe guide buffer device provided in this embodiment is as follows: Figure 2 and Figure 4 As shown, it includes a bracket, a lever 30, a guide roller assembly, a counterweight mechanism and a limiting mechanism.

[0028] The bracket includes a column 18 and a support seat, the support seat is L-shaped, and the support seat includes a support vertical plate 20 and a support horizontal plate 19. The bottom of the support horizontal plate 19 is connected to one side of the support vertical plate 20, and the support vertical plate 20 is fixed on the top of the column 18. A groove 22 is provided on the outer surface of the support horizontal plate 19, and a limit bearing 23 is provided in the groove 22.

[0029] like Figure 5 As shown, a through hole is provided in the middle of the lever 30, and a limiting sleeve 21 is connected to the middle of the lever 30. The limiting sleeve 21 is coaxial with the through hole, and the limiting sleeve 21 is connected to the supporting horizontal plate 19 through a limiting bearing 23. A guide groove 6 and a slide groove 32 are respectively provided on one side of the lever 30 along its length direction, and the bottom of the slide groove 32 is connected to the guide groove 6.

[0030] The counterweight mechanism includes a counterweight assembly and a driving mechanism, and the driving mechanism includes a motor 10, a transmission shaft 11, a driving wheel 12, a synchronous belt 13, a driven wheel 14 and a driven wheel shaft 15. The motor 10 is mounted on the supporting vertical plate 20, and one end of the transmission shaft 11 is fixed to the output shaft of the motor 10. The transmission shaft 11 passes through the supporting horizontal plate 19, the limiting sleeve 21 and the lever 30 in sequence, and the transmission shaft 11 is connected to the supporting horizontal plate 19 through a connecting bearing, and the transmission shaft 11 is respectively clearance-matched with the limiting sleeve 21 and the lever 30. The driving wheel 12 is fixedly sleeved on the other end of the transmission shaft 11, and one end of the driven wheel shaft 15 is fixed to one end of the lever 30 through a connecting bearing, and the driven wheel 14 is fixedly sleeved on the driven wheel shaft 15, and the driving wheel 12 and the driven wheel 14 are connected through a synchronous belt 13.

[0031] like Figure 3 and Figure 6 As shown, the counterweight assembly includes a counterweight block 7, a guide shaft 8 and a guide roller 9. The counterweight block 7 is composed of a plurality of counterweight discs 33, which are detachably fixed to one end of the guide shaft 8. The weight of the counterweight block can be changed by increasing or decreasing the number of counterweight discs. The guide roller 9 is located in the slide groove 32, and the guide roller 9 is connected with the slide groove 32. The guide shaft 8 passes through the lever 30 through the guide groove 6, and the guide shaft 8 can slide along the guide groove 6, and the guide roller 9 is fixedly sleeved on the guide shaft 8. A mounting surface 16 is provided on the other end of the guide shaft 8, and the mounting surface 16 of the guide shaft 8 is fixed to the synchronous belt 13 by a fastening bolt 17.

[0032] The guide roller assembly also includes a support shaft 26, a mounting plate 27 and two guide pulley assemblies. One end of the support shaft 26 is fixed to the other end of the lever 30, the support shaft 26 passes through the mounting plate 27, the mounting plate 27 is connected to the support shaft 26 through a connecting bearing, and the lever 30 is parallel to the mounting plate 27. The guide pulley assembly also includes a pulley shaft 28 and a guide pulley 29. The guide pulley 29 adopts a U-shaped pulley. The two pulley shafts 28 are symmetrically arranged. One end of the two pulley shafts 28 is fixed to the mounting plate 27, and the two pulley shafts 28 are respectively perpendicular to the mounting plate 27. The two guide pulleys 29 are respectively sleeved on the two pulley shafts 28, and the two guide pulleys 29 are respectively fitted with clearances with the two pulley shafts 28. The two guide pulleys 29 are opposite and close to each other. The space surrounded by the two guide pulleys 29 is a pipe channel, and the plastic pipe passes through the pipe channel. The guide pulley 29 can rotate to reduce the friction between the plastic pipe and the guide pulley. The limit mechanism includes a bending limit switch 24, a stretching limit switch 25 and a limit platform 31. The bending limit switch 24 and the stretching limit switch 25 both use a straight stroke switch YBLX-ME-8108. The limit platform 31 is horizontally arranged, fixed on the column 18, the bending limit switch 24 is mounted on the limit platform 31, and the stretching limit switch 25 is mounted on the column 18, and the bending limit switch 24 and the stretching limit switch 25 are respectively located on opposite sides of the column 18. The bending limit switch 24 and the stretching limit switch 25 are both located on one side of the lever 30, and the side of the lever 30 connected to the guide roller is located directly above the bending limit switch 24, and the limit platform 31 is located directly below the bending limit switch 24, and the trigger point of the bending limit switch 24 and the lever 30 can rotate in the same plane.

[0033] The working method of the above-mentioned plastic pipe guide buffer device is:

[0034] 1. If Figure 1 As shown, the production line includes a tractor 2, a metal strip unwinder 3, a buffer rack 4 and the plastic pipe guide buffer device 1, and the buffer device is installed between the buffer rack 4 and the tractor 2;

[0035] 2. The trigger point of the rotary bending limit switch is turned on, the motor rotates forward, the motor drives the transmission shaft to rotate forward, the transmission shaft drives the driving wheel to rotate forward, the synchronous belt drives the guide shaft to move in the direction close to the guide roller, the guide shaft drives the guide roller to roll along the slide groove in the direction close to the guide roller, the existence of the guide roller prevents the guide shaft from contacting the lever, and avoids the friction resistance given to the guide shaft by the lever. The guide shaft drives the counterweight block to move in the direction close to the guide roller, and the force arm of the counterweight block is changed, thereby causing the force arm of the guide roller to be changed, so that the guide roller rotates and gradually approaches the cache rack, and the guide roller moves downward. When the guide roller drops to the lever contacting the limit platform (the trigger point of the rotary limit switch is adjusted to the position where the lever is not triggered before the lever contacts the limit platform), the plastic pipe can be easily passed through the pipe channel at this time, and the motor is turned off to pass the plastic pipe 5 through the pipe channel;

[0036] 3. Rotate the bending limit switch to reset it to the initial position, turn on the motor, and the motor rotates in the opposite direction. The motor drives the transmission shaft to rotate in the opposite direction, and the transmission shaft drives the driving wheel to rotate in the opposite direction. The synchronous belt drives the guide shaft to move in the direction away from the guide roller, and the guide shaft drives the guide roller to roll along the slide groove in the direction away from the guide roller. The existence of the guide roller prevents the guide shaft from contacting the lever, thereby preventing the lever from giving friction resistance to the guide shaft. At the same time, the guide shaft drives the counterweight block to move in the direction away from the guide roller, and the force arm of the counterweight block is changed, thereby causing the force arm of the guide roller to also be changed, so that the guide roller rotates and gradually moves away from the cache rack, and the guide roller moves upward. When the guide roller is raised to the set height, turn off the motor;

[0037] 4. Turn on the pipe extruder and the traction machine, and the plastic pipe 5 is lifted and buffered. When the extruder extrudes too fast, the plastic pipe will be piled up between the buffer rack and the guide rollers, causing the plastic pipe to be too loose, and the plastic pipe will bend when piled up. At this time, the accumulated plastic pipe will generate gravity, breaking the balance of the lever, causing the lever to rotate, causing the guide rollers to rotate and gradually approach the buffer rack (the height of the guide rollers decreases). When the lever rotates to trigger the bending limit switch, Figure 7 As shown, the bending limit switch transmits the signal to the host, and the host controls the pipe extruder to appropriately reduce the extrusion speed of the pipe to achieve a balance between the production rates before and after the production line; when the extrusion rate of the pipe extruder is too slow, the plastic pipe is too tight, the plastic pipe is straightened, and the pulling force of the plastic pipe breaks the balance between the levers, causing the lever to rotate, causing the guide rollers to rotate and gradually approach the traction machine (the guide rollers continue to be lifted). When the lever rotates to trigger the stretching limit switch, as shown in FIG. Figure 8 As shown, the stretch limit switch transmits the signal to the host, and the host controls the pipe extruder to appropriately increase the extrusion rate of the pipe to achieve a balance between the production rates before and after the production line.

Claims

1. A plastic pipe guide buffer device, characterized in that: It includes a bracket, a lever, a guide roller assembly, a counterweight mechanism and a limit mechanism. The lever is movably installed on the bracket. The guide roller assembly includes two guide pulley assemblies. The guide pulley assembly includes a guide pulley. The two guide pulleys are symmetrically installed on one end of the lever. The two guide pulleys are directly opposite to each other. The space surrounded by the two guide pulleys is a pipe channel. The counterweight mechanism includes a counterweight assembly and a driving mechanism. The driving mechanism is installed on the bracket. The counterweight assembly is connected to the driving mechanism and the lever respectively. The driving mechanism can drive the counterweight assembly to reciprocate along the length direction of the lever. The connection between the lever and the bracket forms a fulcrum. The lever reaches balance under the action of the gravity of the guide roller assembly and the counterweight assembly. The bracket includes a column and a supporting seat, and the limit mechanism includes a bending limit switch, a stretching limit switch and a limit platform. The limit platform is horizontally arranged and fixed on the column. The bending limit switch is installed on the limit platform, and the stretching limit switch is installed on the column. The bending limit switch and the stretching limit switch are respectively located on opposite sides of the column. The bending limit switch and the stretching limit switch are both located on one side of the lever. The side where the lever is connected to the guide roller is located directly above the bending limit switch. The limit platform is located directly below the bending limit switch. The trigger point of the bending limit switch and the lever can rotate in the same plane. The side where the lever is connected to the counterweight block is located directly above the stretching limit switch, and the bending limit switch is located above the stretching limit switch. When the guide roller moves downward to a specific position, the lever triggers the bending limit switch or contacts the limit platform. When the guide roller continues to move upward to the upper limit position, the lever triggers the stretching limit switch.

2. The plastic pipe guiding and buffering device according to claim 1, characterized in that: The other end of the lever is provided with a guide groove along its length direction. The counterweight assembly includes a counterweight block and a guide shaft. The guide shaft passes through the counterweight block, and the counterweight block is fixed on the guide shaft. The guide shaft passes through the lever through the guide groove. One end of the guide shaft is connected to the driving mechanism, and the driving mechanism drives the guide shaft to slide reciprocatingly along the guide groove.

3. The plastic pipe guiding and buffering device according to claim 2, characterized in that: The counterweight assembly also includes a guide roller. The other end of the lever is provided with a slide groove along its length direction. The bottom of the slide groove is connected to the guide groove. The guide roller is located in the slide groove. The guide roller is cooperatively connected to the slide groove, and the guide roller is fixedly sleeved on the guide shaft.

4. The plastic pipe guiding and buffering device according to claim 3, characterized in that: The driving mechanism includes a motor, a transmission shaft, a driving wheel, a synchronous belt, a driven wheel and a driven wheel shaft. The motor is installed on a bracket, one end of the transmission shaft is fixed to the output shaft of the motor, a through hole is provided in the middle part of the lever, the transmission shaft passes through the through hole, and the lever and the transmission shaft are clearance-matched, the driving wheel is fixedly sleeved on the other end of the transmission shaft, one end of the driven wheel shaft is fixed to the other end of the lever through a connecting bearing, the driven wheel is fixedly sleeved on the driven wheel shaft, the driving wheel and the driven wheel are connected by a synchronous belt, one end of the guide shaft is fixed to the synchronous belt, and the synchronous belt and the counterweight are respectively located on opposite sides of the lever.

5. The plastic pipe guiding and buffering device according to claim 2, characterized in that: One end of the guide shaft is provided with a mounting surface, and the mounting surface of the guide shaft is fixed on the synchronous belt by fastening bolts.

6. The plastic pipe guiding and buffering device according to claim 1, characterized in that: The support base is L-shaped, and the support base includes a support horizontal plate and a support vertical plate. The bottom of the support vertical plate is connected to one side of the support horizontal plate, the support horizontal plate is fixed on the top of the column, the motor is installed on the support horizontal plate, the transmission shaft passes through the support vertical plate, and the transmission shaft and the support vertical plate are connected through a connecting bearing.

7. The plastic pipe guiding and buffering device according to claim 6, characterized in that: The lever is connected to a limiting sleeve, which is coaxial with the through hole. A groove is provided on the side of the supporting vertical plate opposite to the lever, and a limiting bearing is provided in the groove. The limiting sleeve is connected to the supporting vertical plate through the limiting bearing, and the transmission shaft passes through the limiting sleeve, and the transmission shaft and the limiting sleeve are clearance-matched.

8. The plastic pipe guiding and buffering device according to claim 1, characterized in that: The guide pair of rollers assembly also includes a support shaft and a mounting plate, one end of the support shaft is fixed to one end of the lever, the support shaft passes through the mounting plate, the mounting plate and the support shaft are connected by a connecting bearing, the lever is parallel to the mounting plate, the guide pulley assembly also includes a pulley shaft, one end of the two pulley shafts is fixed to the mounting plate, and the two pulley shafts are respectively perpendicular to the mounting plate, the two guide pulleys are respectively sleeved on the two pulley shafts, the two guide pulleys are respectively matched with the two pulley shafts, and the two guide pulleys are close to each other.

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